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Initial commit of OpenSPARC T2 design and verification files.
[OpenSPARC-T2-DV] / tools / src / nas,5.n2.os.2 / lib / python / html / python / lib / node595.html
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55<H2><A NAME="SECTION00142110000000000000000">
5612.2.11 Package History</A>
57</H2>
58
59<P>
60Version 1 of the <tt class="module">email</tt> package was bundled with Python
61releases up to Python 2.2.1. Version 2 was developed for the Python
622.3 release, and backported to Python 2.2.2. It was also available as
63a separate distutils-based package, and is compatible back to Python 2.1.
64
65<P>
66<tt class="module">email</tt> version 3.0 was released with Python 2.4 and as a separate
67distutils-based package. It is compatible back to Python 2.3.
68
69<P>
70Here are the differences between <tt class="module">email</tt> version 3 and version 2:
71
72<P>
73
74<UL>
75<LI>The <tt class="class">FeedParser</tt> class was introduced, and the <tt class="class">Parser</tt>
76 class was implemented in terms of the <tt class="class">FeedParser</tt>. All parsing
77 there for is non-strict, and parsing will make a best effort never to
78 raise an exception. Problems found while parsing messages are stored in
79 the message's <var>defect</var> attribute.
80
81<P>
82</LI>
83<LI>All aspects of the API which raised <tt class="exception">DeprecationWarning</tt>s in
84 version 2 have been removed. These include the <var>_encoder</var> argument
85 to the <tt class="class">MIMEText</tt> constructor, the <tt class="method">Message.add_payload()</tt>
86 method, the <tt class="function">Utils.dump_address_pair()</tt> function, and the
87 functions <tt class="function">Utils.decode()</tt> and <tt class="function">Utils.encode()</tt>.
88
89<P>
90</LI>
91<LI>New <tt class="exception">DeprecationWarning</tt>s have been added to:
92 <tt class="method">Generator.__call__()</tt>, <tt class="method">Message.get_type()</tt>,
93 <tt class="method">Message.get_main_type()</tt>, <tt class="method">Message.get_subtype()</tt>, and
94 the <var>strict</var> argument to the <tt class="class">Parser</tt> class. These are
95 expected to be removed in email 3.1.
96
97<P>
98</LI>
99<LI>Support for Pythons earlier than 2.3 has been removed.
100</LI>
101</UL>
102
103<P>
104Here are the differences between <tt class="module">email</tt> version 2 and version 1:
105
106<P>
107
108<UL>
109<LI>The <tt class="module">email.Header</tt> and <tt class="module">email.Charset</tt> modules
110 have been added.
111
112<P>
113</LI>
114<LI>The pickle format for <tt class="class">Message</tt> instances has changed.
115 Since this was never (and still isn't) formally defined, this
116 isn't considered a backward incompatibility. However if your
117 application pickles and unpickles <tt class="class">Message</tt> instances, be
118 aware that in <tt class="module">email</tt> version 2, <tt class="class">Message</tt>
119 instances now have private variables <var>_charset</var> and
120 <var>_default_type</var>.
121
122<P>
123</LI>
124<LI>Several methods in the <tt class="class">Message</tt> class have been
125 deprecated, or their signatures changed. Also, many new methods
126 have been added. See the documentation for the <tt class="class">Message</tt>
127 class for details. The changes should be completely backward
128 compatible.
129
130<P>
131</LI>
132<LI>The object structure has changed in the face of
133 <span class="mimetype">message/rfc822</span> content types. In <tt class="module">email</tt>
134 version 1, such a type would be represented by a scalar payload,
135 i.e. the container message's <tt class="method">is_multipart()</tt> returned
136 false, <tt class="method">get_payload()</tt> was not a list object, but a single
137 <tt class="class">Message</tt> instance.
138
139<P>
140This structure was inconsistent with the rest of the package, so
141 the object representation for <span class="mimetype">message/rfc822</span> content
142 types was changed. In <tt class="module">email</tt> version 2, the container
143 <em>does</em> return <code>True</code> from <tt class="method">is_multipart()</tt>, and
144 <tt class="method">get_payload()</tt> returns a list containing a single
145 <tt class="class">Message</tt> item.
146
147<P>
148Note that this is one place that backward compatibility could
149 not be completely maintained. However, if you're already
150 testing the return type of <tt class="method">get_payload()</tt>, you should be
151 fine. You just need to make sure your code doesn't do a
152 <tt class="method">set_payload()</tt> with a <tt class="class">Message</tt> instance on a
153 container with a content type of <span class="mimetype">message/rfc822</span>.
154
155<P>
156</LI>
157<LI>The <tt class="class">Parser</tt> constructor's <var>strict</var> argument was
158 added, and its <tt class="method">parse()</tt> and <tt class="method">parsestr()</tt> methods
159 grew a <var>headersonly</var> argument. The <var>strict</var> flag was
160 also added to functions <tt class="function">email.message_from_file()</tt>
161 and <tt class="function">email.message_from_string()</tt>.
162
163<P>
164</LI>
165<LI><tt class="method">Generator.__call__()</tt> is deprecated; use
166 <tt class="method">Generator.flatten()</tt> instead. The <tt class="class">Generator</tt>
167 class has also grown the <tt class="method">clone()</tt> method.
168
169<P>
170</LI>
171<LI>The <tt class="class">DecodedGenerator</tt> class in the
172 <tt class="module">email.Generator</tt> module was added.
173
174<P>
175</LI>
176<LI>The intermediate base classes <tt class="class">MIMENonMultipart</tt> and
177 <tt class="class">MIMEMultipart</tt> have been added, and interposed in the
178 class hierarchy for most of the other MIME-related derived
179 classes.
180
181<P>
182</LI>
183<LI>The <var>_encoder</var> argument to the <tt class="class">MIMEText</tt> constructor
184 has been deprecated. Encoding now happens implicitly based
185 on the <var>_charset</var> argument.
186
187<P>
188</LI>
189<LI>The following functions in the <tt class="module">email.Utils</tt> module have
190 been deprecated: <tt class="function">dump_address_pairs()</tt>,
191 <tt class="function">decode()</tt>, and <tt class="function">encode()</tt>. The following
192 functions have been added to the module:
193 <tt class="function">make_msgid()</tt>, <tt class="function">decode_rfc2231()</tt>,
194 <tt class="function">encode_rfc2231()</tt>, and <tt class="function">decode_params()</tt>.
195
196<P>
197</LI>
198<LI>The non-public function <tt class="function">email.Iterators._structure()</tt>
199 was added.
200</LI>
201</UL>
202
203<P>
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239<span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span>
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Full OpenSPARC design & verification tarball including full HDL.